I am too in the same boat. My DH was 70 on Sunday spent the weekend with family at home because he didn't want to do something for his birthday in the Summer. Christmas holidays I was mostly alone as family were busy. DH was either asleep or drinking beer and watching TV. He hasn't 'retired' yet so on a work day he scuttles off to his office usually straight from bed, so not even a 'Good morning' is uttered.
After 46 years I suddenly find myself with nothing to do and no one to talk too. Can't believe we stayed together this long if we have never had a conversation but it's only now you realise that life, work and children took over the marriage. Now that's all gone there's nothing but a real empty nest.
I have voiced my concerns with DH, about his lack of interest in me or anything I do but his reply was 'I was being silly'. So nothing has changed or is likely to change. It made me realise that if I did not change, I would go mad. So the housekeeping fairy cleans his (our) house, cook his (our) food, wash his (our) clothes etc as per normal, then I am out of here for the rest of the day.
I joined the U3a, meet new people, go swimming, joined the gym. My philosophy is 'It's your time to shine'. Do you own thing and do not rely on others to entertain you. If you don't do it day, it maybe too late tomorrow.